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\(n_{CuSO_4}=\dfrac{15,2}{160}=0,095mol\\ CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)
0,095 0,19 0,095 0,095
\(m_{rắn}=m_{Cu\left(OH\right)_2}=0,095.98=9,31g\\ V_{ddNaOH}=\dfrac{0,19}{2}=0,095l\\ b)C_{M_{Na_2SO_4}}=\dfrac{0,095}{0,04+0,095}\approx0,7M\\ c)Cu\left(OH\right)_2\xrightarrow[t^0]{}CuO+H_2O\)
0,095 0,095
\(m_{rắn}=m_{CuO}=0,095.80=7,6g\)
Ta có: \(n_{CuSO_4}=\dfrac{16}{160}=0,1\left(mol\right)\)
a. \(PTHH:CuSO_4+2NaOH--->Cu\left(OH\right)_2\downarrow+Na_2SO_4\)
b. Theo PT: \(n_{Cu\left(OH\right)_2}=n_{CuSO_4}=0,1\left(mol\right)\)
\(\Rightarrow m_{Cu\left(OH\right)_2}=0,1.98=9,8\left(g\right)\)
c. Theo PT: \(n_{NaOH}=2.n_{CuSO_4}=2.0,1=0,2\left(mol\right)\)
\(\Rightarrow m_{NaOH}=0,2.40=8\left(g\right)\)
\(\Rightarrow C_{\%_{NaOH}}=\dfrac{8}{200}.100\%=4\%\)
a. PTHH: 3NaOH + AlCl3 ---> Al(OH)3↓ + 3NaCl (1)
Ta có: \(C_{\%_{NaOH}}=\dfrac{m_{NaOH}}{100}.100\%=12\%\)
=> mNaOH = 12(g)
=> \(n_{NaOH}=\dfrac{12}{40}=0,3\left(mol\right)\)
Ta lại có: \(C_{\%_{AlCl_3}}=\dfrac{m_{AlCl_3}}{200}.100\%=13,35\%\)
=> \(m_{AlCl_3}=26,7\left(g\right)\)
=> \(n_{AlCl_3}=\dfrac{26,7}{133,5}=0,2\left(mol\right)\)
Ta thấy: \(\dfrac{0,3}{3}< \dfrac{0,2}{1}\)
Vậy AlCl3 dư
Theo PT(1): \(n_{Al\left(OH\right)_3}=\dfrac{1}{3}.n_{NaOH}=\dfrac{1}{3}.0,3=0,1\left(mol\right)\)
=> \(m_{Al\left(OH\right)_3}=0,1.78=7,8\left(g\right)\)
b. Ta có: \(m_{dd_{NaCl}}=12+200-7,8=204,2\left(g\right)\)
Theo PT(1): \(n_{NaCl}=n_{NaOH}=0,3\left(mol\right)\)
=> \(m_{NaCl}=0,3.58,5=17,55\left(g\right)\)
=> \(C_{\%_{NaCl}}=\dfrac{17,55}{204,2}.100\%=8,59\%\)
c. PTHH: 2Al(OH)3 ---to---> Al2O3 + 3H2O (2)
Theo PT(2): \(n_{Al_2O_3}=\dfrac{1}{2}.n_{Al\left(OH\right)_3}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\)
=> \(m_{Al_2O_3}=0,05.102=5,1\left(g\right)\)
Câu 1:
PTHH: 2Al + 3H2SO4 ===> Al2(SO4)3 + 3H2
a)Vì Cu không phản ứng với H2SO4 loãng nên 6,72 lít khí là sản phẩm của Al tác dụng với H2SO4
=> nH2 = 6,72 / 22,4 = 0,2 (mol)
=> nAl = 0,2 (mol)
=> mAl = 0,2 x 27 = 5,4 gam
=> mCu = 10 - 5,4 = 4,6 gam
b) nH2SO4 = nH2 = 0,3 mol
=> mH2SO4 = 0,3 x 98 = 29,4 gam
=> Khối lượng dung dịch H2SO4 20% cần dùng là:
mdung dịch H2SO4 20% = \(\frac{29,4.100}{20}=147\left(gam\right)\)
nH2 = 6.72 : 22.4 = 0.3 mol
Cu không tác dụng với H2SO4
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
0.2 <- 0.3 <- 0.1 <- 0.3 ( mol )
mAl = 0.2 x 56 = 5.4 (g)
mCu = 10 - 5.4 = 4.6 (g )
mH2SO4 = 0.3 x 98 = 29.4 ( g)
mH2SO4 20% = ( 29.4 x100 ) : 20 = 147 (g)
a, \(CuCl_2+2NaOH\rightarrow2NaCl+Cu\left(OH\right)_2\)
b, \(n_{NaOH}=\dfrac{10}{40}=0,25\left(mol\right)\)
Theo PT: \(n_{CuCl_2}=n_{Cu\left(OH\right)_2}=\dfrac{1}{2}n_{NaOH}=0,125\left(mol\right)\)
\(\Rightarrow m_{Cu\left(OH\right)_2}=0,125.98=12,25\left(g\right)\)
c, \(C_{M_{CuCl_2}}=\dfrac{0,125}{0,1}=1,25\left(M\right)\)
\(n_{NaOH}=\dfrac{10}{40}=0,25\left(mol\right)\)
PTHH:
\(CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2+2NaCl\)
0,125 0,25 0,125 0,25
\(m_{Cu\left(OH\right)_2}=0,125.98=12,25\left(g\right)\)
\(C_{M\left(CuCl_2\right)}=\dfrac{0,125}{0,1}=1,25\left(M\right)\)
\(n_{FeCl_3}=\dfrac{48,75}{162,5}=0,3(mol)\\ 3NaOH+FeCl_3\to Fe(OH)_3\downarrow+3NaCl\\ \Rightarrow n_{Fe(OH)_3}=0,3(mol);n_{NaOH}=n_{NaCl}=0,9(mol)\\ a,m_{Fe(OH)_3}=0,3.107=32,1(g)\\ b,m_{dd_{NaOH}}=\dfrac{0,9.40}{10\%}=360(g)\\ c,C\%_{NaCl}=\dfrac{0,9.58,5}{360+48,75-32,1}.100\%=13,98\%\\ \)
\(d,2Fe(OH)_3+3H_2SO_4\to Fe_2(SO_4)_3+6H_2O\\ \Rightarrow n_{H_2SO_4}=0,45(mol)\\ \Rightarrow m_{dd_{H_2SO_4}}=\dfrac{0,45.98}{20\%}=220,5(g)\\ \Rightarrow V_{dd_{H_2SO_4}}=\dfrac{220,5}{1,14}=193,42(ml)\)
Bài 7 :
200ml = 0,2l
\(n_{CuCl2}=2.0,2=0,4\left(mol\right)\)
Pt : \(CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2+2NaCl|\)
1 2 1 2
0,4 0,8 0,4 0,8
\(Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O|\)
1 1 1
0,4 0,4
a) \(n_{CuO}=\dfrac{0,4.1}{1}=0,4\left(mol\right)\)
⇒ \(m_{CuO}=0,4.40=32\left(g\right)\)
b) \(n_{NaCl}=\dfrac{0,4.2}{1}=0,8\left(mol\right)\)
⇒ \(m_{NaCl}=0,8.58,5=46,8\left(g\right)\)
\(m_{ddCuCl2}=1,35.200=270\left(g\right)\)
\(m_{ddspu}=270+100=370\left(g\right)\)
\(C_{NaCl}=\dfrac{46,8.100}{370}=12,65\)0/0
Chúc bạn học tốt
\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)
PTHH: Fe2O3 + 3H2SO4 --> Fe2(SO4)3 + 3H2O
______0,05------>0,15--------->0,05
=> mH2SO4 = 0,15.98 = 14,7(g)
=> \(C\%\left(H_2SO_4\right)=\dfrac{14,7}{100}.100\%=14,7\%\)
\(C\%\left(Fe_2\left(SO_4\right)_3\right)=\dfrac{0,05.400}{8+100}.100\%=18,52\%\)
PTHH: Fe2(SO4)3 + 6NaOH --> 2Fe(OH)3\(\downarrow\) + 3Na2SO4
________0,05----------------------->0,1
=> mFe(OH)3 = 0,1.107=10,7(g)